Polishinq-machinf



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J. G. 0. MANTLE.

POLISHING MACHINE.

APPLICATION HLEO NOV-16.19. IEIIEVED St". 23. lill.

1,313,402. Patented .19,1919.

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POLISHING MACHINE.

APPLICATION FILED NOV. I6, "l4. RENEWED SEPI. 23. l9l6. 1,313,402. Patented Aug. 19, 1919.

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ATTORNEYS J. G. C. MANTLE.

POLISHING MACHINE.

urucmon FILED nov. 16. m4. mmuzo SEPT- 23.1915.

Patented Aug. 19, 1919.

S H E ET 4 mmrbn Arronzsrs Z WIT/(E8858 J. G. C. MANTLE.

POLISHING MACHINE. APPucAnpu FILED NOV. l6. I914. RENEWED PL 23. I916- 1,313,4:O2. Patented .19 9.

WI M58858 INYENTOB MiLM P a I Br- 4:

ATT0RHY8 J. G. C. MANTLE.

POLISHING MACHINE.

Armcmlou FILED nov. [6. m4. nzuswso sin. 2a. 1915.

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Patented Aug. 19, 1919.

I96 INYENTOR I M i C. M

'HTORNEYS J. G. C. MANTLE.

POLISHING MACHINE.

APPucmbn FILED NOV. 16. I914. azncwznswr. 23. 1916.

1,313,402. Patented Aug. 19, 1919.

I0 SHEETS SHEET 10.

WITNESSES INVEN TOR I I l 2 A TTORNEYS UNITED, STATES PATENT OFFICE.

JOSEPH G. 0. ME, 01 NEW YORK, N. Y., ASSIGNOR TO STERN-COLE-m DIAMOND CHINE 00., INC., A CORPORATION OF NEW YORK.

POLISHING-MACHINE Specification of Letters Patent.

Patented Aug. 19, 1919.

Application fled. llovember 16, 1914, Serial Io. 872,368. Renewed September 28, 1918. Serial F0. 121,906.

To all whom it may concern:

Be it known that I, J osnrn G. O. MAN'ILE, a citizen of the United States, and a resident of New York,'county of New York, State of New'York, have invented certain new and useful Improvements in Polishing- Machines, of which the following is a speci- 4 and great care. Among the various objects,

features and advantages of the invention are the followinfg:- I

A stone 0 determined or known diameter of girdle may be readily and easily set into exact position for the grinding of any numher and of any desired an le'of facets, or for the grinding of its tab e at any desired height above its girdle and the grinding or polishing automatically stopped at the desired point.

An operation. scale is rovided, easily readable to within one one-t ousand'th of an inch, which may be readily as desired, or in accordance with calculatedtables for the grinding of stones of various diameters of girdle, and number and angle of facets,- the scale being adapted to'be set in accordance with the diameter of. girdle number of facets and height of table above the girdle, required. A setting scale, easily readable to within one one-thousandth of an inch is provided,- which may bereadily set as desired in accordance with calculated tables, so that stones of various sizes and shapes may be readil set into exact position for the grinding of table and facets of required number and angle thereon, and such, that when rotated, in order that the grain of the stone may' be brought into pro r relation with the moving, grinding or po ishing surface, the narrowest possible band on the grirding surface or grinding disk may be use rectly indicatin to wit in one one-thousandth of an in progress of the grindin operation and the amount to be ground 0 is continually indicated, this grinding scale being so arranged that when any of the grinding operations are com leted, the scale reads at zero, or a ertain xed point, irrespective of the kind of LOBJGIatlOIl or the amount to be ground oil", cans are provided for independently ad- ]ustmg the apparatus tosuit an altered relatwo level of grinding surface to the parts holding the stone, due to the wear of the grinding surface or other causes, such adustment not affecting any other adjustment or scale reading.

Iigidproved positively acting means are pro vid for automatically withdrawing the stone from the inding surface, when the grinding or po ishing operation is completed, and such that this withdrawal may always occurat the zero reading or fixed point reading on the indin scale. This withdrawal is accomp' ished y a tripping mechanism, which is of such a nature that should the operator omit to set it the machine cannot ind down beyond the required point. flicient adjusting means are provided to compensate for the wear of this tripping mechanism, so that it may always operate at the zero or fixed point reading on the grinding scale.

Means are provided whereby the stone may be reciprocated on the grindin surface, and both amplitude and rate 0 such reci rocation be varied as desired, within pre etermined limits.

Improved means are provided for shiftirig the stone laterally over the grinding surface, in order to remove it from one grinding band to another, and further means are provided whereby the stone is automatically slightly withdrawn from the grinding surface, prior to giving it such ateral movement.

Improved means are provided for radually mcreasing the pressure with which the stone is pressed against the rinding surface and for causing the ra ual approach of the stone to the grin ing surface, and such that when the grinding or polishing operation is completed the stone may be quickly removed rom the polishing surface without being retarded by the means for causin the gradual approach of the stone towar the grinding surface.

The apparatus is so arranged that a stone may be removed from the polishing surface during any operation thereon, for the purpose of inspection of the stone, without stopping the machine, or interfcrin in any way wit 1 its adjustments, and permitting of the immediate replacing of the stone against the polishing surface, in exactly the same position that it, was before such removal.

The arrangement of the various parts of the machine are such that it occupies very small space, whereby a plurality of machines may be operated in conjunction with a single grinding or polishing wheel or disk of the usual dimensions. The various parts of the machine are so arranged and so easily adjusted that a single operator may attend to a plurality'of machines, and without any danger of the stones being ground further than desired.

Various other objects features and advantages will more clearly ap )ear from the detailed descri tion given be ow, taken in connection witi the accompanying drawin s, which form part of this specification.

inferring to tie drawings :Fignre' 1 represents an elevation of a machine embodying my improvements in a preferred form, certain parts being shown in section to more clearly illustrate the same. Fig. 2 is a plan view of the machine. Fig. .3 is an end elevation of the machine, certain parts being shown in section, in order to more clearly illustrate the same. Fig. 4 is also an end elevation, showing the opposite. end from that shown in Fig. 3. Fig. 5 is a vertical section of the dop-holdcr or stoneholding arts, taken on the line 5-5 of Fig. 4. i 6 is a section taken on the line 6-6 0 Fig. 5. Fig. 7 is a plan view of pants shown in Fig. 6. the top adjusting thumb nut bein removed. Fig. 8 is a horizontal section t-lfifltn on the line 8-8 of Fig. 1. Fig. 9 is a vertical section showing certain details, taken on the line 9--Sl of Fig. 8. Fig. 10 is a horizontal section taken on the line 10-10 of Fig. 9. Fig. 11 is a section of certain parts similar to Fig. 5 but certain of the parts shown in Fig. 9 being shown in full. Fig. 12 is a section taken on line 12 of Fig. 10. Fig. 13 is a section taken on line 18 of Fig. 10. Fi 14 is a vertical section of the mechanism x taken on the line 14-14 of Fig. 8. Fig. 15 is a section taken on the line 15 of Fig. 14. Fig. 18 is a vertical section taken on the line 16-16. of Fi 14. Fig. 17 is a section taken on the line 1 17 of Fig. 14. Fig. 18 is a detailed view of certain parts of the tripping mechanism. Fig. 19 is a similar view, showing the parts in a different position. Fig. 20 is a vertical section taken on the line 2020 of Fig. 1. Fig. 21 is a vertical section taken on the line 21--21 of Fig. 1. Fig. 22 is a section taken on the line 22-22 of Fig. 8. Fig. 23 is a section taken on the line 23-23 of Fig. :22. Fig. 2-1 is a sew tion taken on the line 24-2-1 of Fig. 1!). Fig. 25 is a detail view showing certain parts of the reciprocating mechanism, shown in horizontal section in Fig. 8. Fig. 26 is a detail view showing means for holding the rhcostat adjusting lever in )osition. Figs. 27 aml '28 are detail views. i lustrating the method of adjusting the position ot the diamoml or other body to be ground or polished, in the nmchinc. Fig. 29 is a dctail view of one of the gears and pawl and ratchet mechanism. shown in Fig. H. Fig. 30 is a section taken on the line 30-30 of Fig. '3 Figs. 31 to 34 inclusive illustrate onc. nicthod of positioning the diamond or other bod to be ground or polished in the machinc. Figs. 35 to 38 inclusive illustrate another method of positioningthe diamond 01' other body to be ground or )OllSlled. in the machinc. Figs. 39 to 42 inclusive illustrate still another method of positioning the diamond or other body to be ground or polished. in the machine.

A grinding operation is ordinarily coin mcnccd on thc rougher bands of a polishing lap. and shifted. as the operation proceeds, from one band to another till finally com- )letcd on an exceeding true. and smooth mnd.thc finishing band,which. when a nntchiue is used. should have a slightly higher level than the oth r bands of the grinding surface. it is vcr v useful to have a dial and pointer. or something of the kmd. which shall show at all times the stage of the grinding operation: so that the operator, without having to examine the stone. being ground. may know on what porti in of the grinding surface the operation should procccd. ln addition. it is dcsirablc..-'1st,in order to relieve the memory of the operator and so prcvcnt mistakes. that the pointer. at the completion of each operation. should occu i the same position.irrespective ot' the ind of operation and the extent or amount of grinding done. 2nd.-that the grinding dial should at all times show, by direct reading. the amount. to within a small fraction of a thousandth of an inch. which remains to be ground off before the operation is complctc. ilrd.that the fixed point of reading of the completed operation should he unali'ectcd by the various adjustments and settings in the machine: for instance-the adjustment compensating the inaccuracy of cementing the stone in its arbor. the mljust-ments providing for dill'en ent angles and number of facets and for different heights of table above the girdle, the :uljustmcnt compensating for the rela tivcly changed positions of the surface of the finishing band due to its wear-o1 the wear of its supporting surfaces and also the wear of the supporting parts of the stone-containing arbor, forming part f the machine. 4th,that the dial or ointer should be readable on both sides of t e machine, so that a foreman operator, in assing, may become aware of the stage 0 operation and progress in a series of machines.

It is also desirable that there be a ready and practical means to readjust with extreme precision, the distance of the stonecontainin r arbor from the finishing-band of the grinding surface; otherwise, the scale would become incorrect and the amount ground awa wouldbe more or less than reuired. 'This is owing to one or more of the ollowin causes :to the wearing away of the nishing-band of the grindlng-surface, or its transference to another osition of different level ;to the wear of t e supporting surface, or its grinding surface ;or to the wear of the supporting parts of the stone-containing arbor forming part of the machine. It is very desirable that this readjustment of distance be made in a manner not affecting and renderi the readjustment in the machine, and for this reason machines have been hitherto readjusted by adjustin the machine bodily relatively to the g surface, or, read usting the position relatively to the body or stand of the machine, of the arm extending over the grinding surface and on which the stone-containin arbor is in some manner supported. ese methods have been found difficult. and impracticable, not only on account of the extreme precisionof distance, but also because the finishing-band, in addition to being smooth and plane, must also be truly at right angles with the axis on which the stone-containing arbonmust yet rotate while having its axis inclined to the grinding surface in order that the grain o the facet of the stone being ground may be in proper relation to the motion of the grinding-surface. In machine the readjustment is made directly 'over the finishing-band of the grinding-surface, in the aforementioned axis at right an les to that surface, and in a manner not a ecti any. other adjustment or scale-reading w atsoever.

Referring to the various drawings, more particularl to Fig. 1,-1 represents a rota polishing a the upper surface of whic acts as a grinding or polishing surface for grinding or polishing the stone or other ody to be ground or polished. The lap 1 is adapted to be rotated by the spindle 2 as its axis. The diamond is illustrated at 3, (see also Figs. 5 and 6), the diamond bein cemented in or otherwise fastened to an ar r 4. The arbor 4 is secured ina hollow spindle or dop indle 5 b screw 6. A pm passes rough the'arbor 4 and enters a slot 8 ofl' center in the spindle 5 in order that the arbor will always be placed in the spindle at the proper angular means of a set.

position relative to the index flange 11 heretapered end is threaded into the carrying head 15 and when screwed inwardly, its tapered end acts on a member 17 to securely clamp the dop-spindle sleeve 9 and hold it rigid with respect to the carrying head 15 see also Fig. A screw 18 prevents the s eeve 14 from turning. B loosenin the set screw 16, and operating t e flange-nut 13, the dop spindle sleeve 9, to her with the arbor 4 and stone 3 carried t ereby may be raised with respect to the carrying head 15, as desired. The carrying-head 15 is provided with an extension 19, sliding in an arcuate guide 20. A stud 21, secured to the head 15, passes through the arcuate guide, and is provided with a flangenut 22 for the purpose of locking the head 15 in any of itsvarious positions with ret to the arcuate guide 20 (see also Fig. 3: In order that index flan e 11 may be locked in any of its adjuste positions, it is serrated at 23 upon its underneath outer edge, and a locking lever 24, pivoted with respect to. the dop-s "indle sleeve 9 on the extension 25 on a co ar 28, has its outer end adapted to engage the serrations at 23 to lock the index flange 11 in its adjusted position locking lever 24 being pressed upwardl by means of a plu r 26, acted upon y a spring 27, carried y a collar 28 upon the domindle sleeve 9. A latch lever 29, also PIV to the collar 28 has a member 30 adzzptcd to press downwardly and withdraw e catch 24 from the serrations at 23 to unlock the index flange 11. The locki lever 24 and member 30 are so aha that when the latch lever 29 is drawn to e extreme downward position, the lockmg lever 24 will be locked in its withdrawn position.

The bushin 14 is provided with two upwardly exten mg lugs 14' (see Figs. 6 and 7) between which the extension 25 is free to slide; but which extension 25 prevents rotary movement of the sleeve 9 with respect to the bushin 14.

Also carried by t e carrying head 15 is a bushing 31, in the to end of which is a screw threaded, and a justing flange sleeve 32, having a setting scale periphery at 33. The flange sleeve 32 carries a s indle 34, having an enlarged portion 35 low the flange sleeve 32 and a head 36 secured thereto Y between the parts. The. enlarged portion 35 has a l\'c way to prevent its rotation with respect to the bushing 31, while permitting its vertical adjustment therein, upon the operation of the. flange sleeve 32. A screw its having a key shaped end, operates through the side of the carrying head 15 and lmshing 31 to prevent rotation of the spimlle H. The lower end of the spimlle 34 carries a head 39, which, in turn, has slidably mounted therein, a setting indicator or pointer -10. The setting imlicator may be moved transversely by means of a gear 41, engaginga rack -12 on the indicator 4(), the :Icar 41 being.' turned by a knob 43. The gear 11 is provided with a Hat face, as shown in Fig. 5, which llat face is adapted to be engaged by a spring pressed )lunger 44, so that when the pointer 40 is wit alrawn from the stone 3. it will be sustained in such withdrawn position. The pointer 40 is designed, when the reading on the. settin scale is zero, to point to the center of the are formed by the arcuate guide 20,-01', in other words, the center of the dop-arc. and any adjustment of the setting indicator it), by turning the knob 43, does not alter this condition. The arcuate guide 20 is carried upon the lower end of 'a hollow spindle 45 (see Fig. H), which is encircled by a main sleeve 46 passing verticallv through a carrying frame or mechanism box 47. The mam sleeve 46 is prevented from rotating in the mechanism box by means of a. feather 48. engaging a slot. 49 in the main sleeve 46. The hollow spindle 45 has passing therethrough a spindle 50, having an enlarged head 51 at its upper end and a nut 52 screw thread cd upon its lower end for the purpose of holdingthe spindle 50 within the hollow spindle 45, the washer 53 slidably feathered on the spindle 50 being interposed between the nut 52 and the hollow s indle 45. A pin 54 passes through the heat 51 and main sleeve 46 for the purpose of securin the spindle 50 to the mam sleeve 46. rew tn'eaded upon the upper end of the main sleeve 46 is an adjusting flange sleeve havin r thereon an operation scale 56. The threats of the flange sleeve 55 are pitched ten to the inch, as are also the threads on the flange sleeve 32, so that one turn of these sleeves will move their respective ad'usting .parts one-tenth of an inch, and han redths and thousandths of an inch may be easily scaled ofl' on the scales 56 and 33respectively. The upper -end of flange sleeve 55 is engaged by a collar 57 screw threaded upon and SQCltItK to a sleeve 58 by means of a screw 59. A screw rod 60 is positioned within the sleeve 58 and has a flange 61 engaged between the collar 57 and upper end of the sleeve' 58. The screw rod 60 has screw threaded upon its lower end a hollow spindle 62, enlarged at its lower end at 68 (see also Fig. 15), the enlarged portion being prevented from a rotative movement by having a slot therein engaged by the feather 48. A series of springs 64 and piston plungers (35 operate between the end of screw rod 60 and the enlarged head 51, tending to sepa rate the two. Screws 66 hold the feather 48 in place in the frame, and the hollow spindle 45 is provided with a spiral recess 67 containing a lubricant.

The mechanism box 47 is provided with stalling boxes 46' on' each side thereof where the main sleeve 46 forming part of a main sliding spindle carrying the dop. enters the mechanism box. 'lhescstutlingboxes contain suitable soft cleaning material to clean dust and dirt from the spindle or sleeve 46 where it. enters and bears in the box or frame 47 to prevent the dust and dirt from ati'ecting the movement of the spindle through the frame 47.

One portion of the outer lower face of the hollow sleeve 62 is provided with a vertical rack 68, engaged by a segment 69, having an integral lever 70 pivoted at 71 to the frame of the mechanism box. The turning of the screw rod 60 raises and lowers the sleeve 58 along with the collar 57, the flange sleeve 55, the main sleeve 46, the spindle 50, the hollow spindle 15, the carrying head 15, aml the parts carried thereby, including the stone to be ground, all with respect to the hollow spindle 62 and consequently with respect to the pivot 71 and lever 70. Likewise the turning of the flange sleeve raises and lowers the main sleeve 46 along with the spindle 50 and thereby the carryin head 15 with the parts carried thereby, all with respect to the pivot 71 and lever 70.

It will be seen that if the segment 69 be turned in a direction to force the rack 68 downwardly, the main sleeve 46, together it-h all the parts contained therein and the carrying head 15, with the stone to be round, will be carried downwardly toward t to polishing lap 1. In order that this may be done, the segment 69 is engaged by a seg ment 72, having integral therewith a segment 73, enga ing a pinion 74, the pinion 74 having 'aws 5 roJecting lateral y therefrom, a apted to e engaged by jaws 76 (see Fig. 2-2) integral with the shaft 77, passing throu h the outside cover of the mechanism box 44, and which shaft 77 has secured to the outside thereof an arm 78, carrying a screw 7 8' (see also Fig.1) on which is adjustably mounted a weight 79 by turning the head 80 of the screw 7 8. Thus, the action of gravity on the weight 79 rotates or tends to rotate the gear counterclockwise which, acting through the segments 7 2 and 73, rotates or tends to rotate the segment 69 counterclockwise, as viewed in Fig. 14, and thereby forces or tends to force the stone carrying parts downward toward and with which the stone is against the polishing lap 1. It will be seen that if .the arm 78 is near the vertical position, the action of gravity in this respect will be far less than if the arm 78 is in a horizontal position, as sliown in Fig. 1. In-

operation, when the indin of a stone starts, the arm 78 will positioned near to the vertical, and as the grindin proceeds, the arm 78 will move toward the position shown'in Fig. 1, so that as the rinding proceeds, the weight 79 will force t e stone against the polishing lap with greater force, as desired. The action of the weight in this respect ma be adjusted by turning the thumb heat 80, so as to adjust the position of the weight with respect to the short shaft 77, to suitthe size of stone and stage of operation. In order that this varying force ressed' against the polishinglap may not affected by the weight of the stone carrying parts moving toward the lap, through the mechanism box -17, and means may be provided tending to force the s indle 62 upwardly against the action of t e weight 79, in order that the readin s on a grinding scale hereinafter describe may be more accurate, the wei ht of these'moving parts is slightly overb anced by means 0 a spring 8 acting upon the lever 82 at 83, the lever 82 being pivoted at 84 and having its long arm provided with teeth 85, en 'ng the rack 68, so that the spring 81 ten s to raise the stone carryingpart'smovable with respect to the mechanism box 47.

The movement of the dop carryin a stone toward the grinding-surface must slow; otherwise, the stone or the inding-surface, or both, may be injured; erefore the d or stone carryin parts should be so moun and connected t at other than a slow approach is impossible. Machines have been constructed having hydraulic or pneumatic mechanism for this p but have roven unsatisfactory. In this machine, or the aforesaid purpose, mechanism hasbeen devised and adapted dependent for its eflectiveness upon the resistance ofl'ered b mass to alternate acceleration and meta ation, and where friction is reduced to a minimum, so that to a slow rate of movement there is but little resistance. Therefore, in order that before the grinding of the stone is started,

and the stone is moving downwardly with its grinding parts toward the polishing lap,

these downward movements may be satisfactorily retarded, the pinion 74 has secured thereto a ar 86, meshin with a stud 87, which i n eshes with a iiiion 88, which l i: secured thereto a ar 9, meshing with a pinion 90, carried oosely on its shaft. Affixed to the pinion 90 is a ratchetwheel 91 adapted to be engaged by a sprin pressed pawl 02, carried by a gear 98, whic meshes with a pinion 94, secured to a g t W the grinding operation me meshes with a pinion 96. The details of the r'at'chet wheel 91 and s ring pressed pawl 92 .are clearly shown in igs. 29 and 30. The inion 96 carries an eccentric 97 (see also lg. 16), which eccentric operates in the vertical slot 98 in a weight 99, pivoted at 100, so that as the stone and its carr ing parts move toward the polishing lap, 15 ie gear 96 is rapidly revolved theicby, causing a rapid reciprocation or oscillation of the wei ht 99, which, because of its inertia, retards t .e aproach of the stone toward the lishing ap. The segment 73 also acts to rive the pinion 101, which has secured thereto a gear 102, meshing with a pinion 103, having secured thereto a gear 104, meshing with. a pinion 105,'which has a shaft extending out through the frame or mechanism box 47, and has secured thereto a inter 106, oc operating with a dial or grinding scale 107 (see also Fig. 17), so that, as the stone to be round moves toward the polishing lap 1, the amount of such movement is accurateh measured to one one-thousandth of an inc upon the die] or scale 107. A du licate pointer 106', cooperating with dis. scale 107' is also operated by the gear 105, so that the movement of the stone toward the polishing lap, and consequently the progress of be watched from either side of the mac ine. A or 108 also meshes with pinion 106 an a spring 109 tends to rotate the 108 in the opposite direction from whi it is rotated by the pinion ,105. This takes up all the back las between the various gears. In the to of the frame or mechanism box 47 is an late the weight 99, because when the pinion 90 is rotated'in this reverse direction, the teeth of ratchet wheel 91, which is secured to the pinion 90, slip under the spring p pawl 92, so that the gear 93 is not rotated and consequently, the weight 99 is not reeiprocated. 0

In addition to a grinding-scale 107, it is useful to prevent further grinding than is required. In other we to provide a means preventing the fu er decrease of the distance of the stoneoontaining arbor from the grinding surface. It is advantageous that thissto should have but one position so that no a ustments be necessary to suit the different amounts of grinding required. It is also desirable, when the completio' n stage is ;arrived at, that then the mam a tomaticall increases the di ire between the stone-conaining arbor and the rinding-snrface; otherwise, this stage would lie indefinite and dependent on the extent of time of contact with the grindin -surface. In other words, that the mach ne be provided with an autonnitic trip acting upon the eompletion ofv a grinding operation as determined by a stop preventing the further decrease of distance of the stone-contain-in r arbor from the 'rindiug-surface. ln grind ing diamonds, t ie arrest of the grinding operation for the several facets must be uniform to an extreme degree. In this machine, to attain great precision of stopping position, that member of the trippin mechanism, to be affected in order to e ect the tripping, has a ma 'uificd movement toward the member whie 1 affects the aforementioned member, which effects the trip. Also, the principle and arrangement of the tri pin mechanism is such that an exceeding y smal force acting through an exceedingly small distance is. 10( aired to operate the aforementioned member which effects the trip. Moreover, as in this machine, the tripping, or, in other words, the completion of the (grinding operation, always occurs at a fixe point of reading on the grinding-scale, there 18 provided an adjustment taking care of the wear of parts of the mac line, so that the tripgiing may always occur at this fixed pointo reading.

In order that the stone may be thus automatically withdrawn from the polishing lap whenever a face or facet thereon has been and to the predetermined or desired extent, the following mechanism is provided for causing the lever '70 to move in a clockwise direction, to raise the stone carrying mechanism. The lever has a dependent inte al arm (see also Figs 16, 18 and 19), to w ich is pivoted at 111a lever 112. The short upper arm of the lever 112 carries pivotally mounted thereon an abutment 118 u n the upper end of which rests one an o a compremion spring 114,-the other end of the compression spring being seated in a cup-shaped depression in the lever 70. Integrally attached to the lever 112 is a segment 115, the teeth of which engage a pinion 116, ournaled'on the lever 70, at 117. The pinion 116 has fixedl secured thereto a seg ment 118, the teeth 0 which mesh with a in- 1 on 119, also journaled on the lever 70. lso Journaled onthe lever 70 at; 120 is a lever 121, having a short arm 122, u n which is pivoted a member 128, weighte at its lower end at 124. The lever 121 is also provided with an integral u ward extension 125 ada ted tobe engage by catch 126 secured to t e pinion 119. Also journaled on the lever 70 is a further lover or trip device 127, pivoted at 128, having a long arm 129 adapted to on go the end of they lever 121 to hold the sax ong arm from being pulled upwardly by the. action of weight 12-1. suspended from short arm 122. The trip device 127 is also provided with a short arm 1 H), adapted, when the grinding of a face or facet of a stone has progressed to the. desired mild, to engage a pin 131, serew-threaded into a pivot. arm 132, which arm is held against an adjustable stop 133, by means of spring 134. the pivot arm 132 being pivoted at 130. Also serew-threiuled in the. mechanism box 47 is an adjustable, stop 1216, adapted to be engaged by the lon arm of lever 112, when the long arm 129 Slips oil the lever 121.

The operation of this trip mechanism is as follows:-As the grinding of the faceor facet of the stone progresses, the main sleeve 46, together with its contained parts, among which is the rack 68, moves t ownwardy or toward the polishingsurface. This causes a gradual rotation of the segmeat 69 counterclockwise, as viewed in Figs. 14, 18 and 19. This causes the, lon lever arm 70 to be raised, carrying with it the parts 111 to 128 inclusive. This movement continues until the arm 130 engages the pin 131, thereby causing an extremely slight movement of the trip device. 127 about its ivot 128, so that the arm 129 slides off the ever 121, thereby permitting the weight 124 to rock the lever 121 counterclockwise, and off of the catch 126, permitting the s n'ing 114 to not between the lovers 70 an 112, to cause the lever 112 to move about its pivot. That is, when the parts are set, as shown in Fig. 14, the spring 114 acts on the lever 112, tending to move the same counterclockwise. This causes the segment- 115 to act u )0 the pinion 116, and se ment 118, ten ing to move the same cloclrwise, and the segment 118 tends to move the pinion 119 and catch 126 counterclockwise. against the upright arm 125, so as to hold the, lever 112 in the position shown in Fig. 14, the engaginw surfaces between the. arm 125 and catch 126 being so sha ed that immediately the arm 129 slips 0 of lever'121, the action of the spring 114 aided by the weight 124 easily rocks the lever 121 to release the catch 126. And when the arm 125 so moves off of the catch 126 by t-he action of the sprin 1H and weight 124, as above explained? the sprin 114 is permitted to oscillate the lever 112 a at its pivot, so that the long arm of the lever 112 engages the stop 136, whereupon the. spring 11-t acts to pull the lever arm 70 downwardl thus rotating the segmeat 69 in a cloc wise direction, to raise the rack 68 and )arts carried thereby, includm the stone )clllg ground, so that the stone is withdrawn from the polishing surface. That is. when the trip device 127 is operated by coming into engagement with the screw pin 131, the spring 114 acts to force the parts into the position shown in Fig. 18.

In order to reset the parts asshown m Fig. 14, fromthe position shown in Fig. 18, the weight 79 or arm 78 is grasped by the hand and turned, as far as poss1ble 1n a clockwise direction, as viewed in Fig. 1. The extent of this movement is determined by the contact of the lever 70 with the fixed pm 187. That is, the stone carrying parts are given a still further movement away from the polishing surface, so that the side of the segment 115 engages the fixed pm 137, causmg a reverse movement of the segment 115, and also a reverse movement of the lever 112, so as to compress the spring 114. At the same time the member 123 engages a fixed pin 138, as shown in Fig. 19,

' This reverse movement of'the lever 121 also permits the long arm 129 on trip device 127 to be brought into engagement with and catch the long a-rm oflever 121, in order to lock the same in this position (see Flg. 19). A stop 139 limits the movement of trip device 127 in this reverse direction, a stop 140 limits the movement of the lever 121 in the Po weighted that its long arm tends to rotate counterclockwise direction, and a stop 149' in clockwise direction. Trip device 127 is in front of long arm of lever 121, as soon as a sufiicient reverse movement is given to the latter. The parts then being as shown in Fig. 19, are ready for another grindin operation and when the hand is release from the arm 78 or weight 79, the stone ca ing parts gradually descend,'retarded by t e weight 99, and will act to withdraw the stone in a similar manner when the grinding has again progressed to the desired predetermined extent. Toward the-extreme .portion of the resetting movement, a pm 250 on gear 181 (see Fig. 22) engages a lever arm 251, pivoted at 252 and acted upon by a spring 253 to normally hold it against a stop 254. When the pm 250 engages the spring pressed lever 251, as shown in dotted lines, it acts to compress the spring 253, whereupon, upon the release of the weight 79 or lever arm 78 by the hand of the operator the spring 253 moves the arm 78 to the le t hand side of the vertical, as viewed in 144. inte-.

about the pivot 71, the spring being of suflicient strength to balance the weight of the arm 70 and trip mechanism parts carried thereby.

In polishing gems, more "particularly polishing diamonds, as the polishing or grinding operation proceeds, it is desirable to shift the stone transversely to the polishing lap, in order to bring it into enga ement with a different surface or band on t e polishing lap. A grinding operation is commenced 'on the rougher portions of the grinding-surface and if the stone be given a slow reciprocative motion, crosswise to the motion of the grindin -surface, then time is saved in grinding an also the grinding-surface improved and sustained in truer condition. -As the grinding proceeds it is necessary to shift the stone laterally so that the grinding may be on the adjacent bands, but before shiftlng to a new osition, the grinding-pressure should be reheved, otherwise the stone may be damaged, as also the grinding-surface. For this pur ose the following mechanism is provide The mechanism box 47 is sup rted u on a guide bar 145 (seeFig. 4). he mec anism box 47 is provided with a stri 146 at the lower edge of its inside face, and with a screw 147, for forcing the same into close engagement with the guide bar 145. The mechanism box' is slidable longitudinally or parallel to the polishing surface, alon the guide bar 145. The guide bar 145 is s otted longitudinally and contains therein bar 190, lon tudinally movable in the guide bar, but he}; fixed wlth respect to the guide bar 145, unless it is desired to reci rocate the stone over the lap, as will be ereinafter more fully explained. The bar 190 is cut away at 148 (see Fig. 8) and has secured therein, as by pm 155 a screw 149, on which is carried a collared nut 150, having on one end a miter gear 151, meshing with a miter gear 152, secured to the shaft 153, journaled in the mechanism box 47 and the flange bearing 148 (see also Figs. 9 to 13). The collars on nut 150 engage 'a projection 154 On the mechanism box, so that u on the turnin of the gears 151 and 152, the mechanism x 13 forced to slide horizontally along the guidebar 145.

Secured to the other end of shaft 153 is a driven member 167 having opposite arms,

- the driving the driven member 167 is an intermediate member 160 which has a flange 164 integral with a air of oppositely disposed cams 163 hig. 1 the transverse extremities of WhlCh orm ockets 165 (Fig. 11)., for the rollers 16 carried on the driven member 167.v Surrounding the shaft 153 is a friction device comprising a series of friction rings 182 alternated with a series of friction rings 183, all contained in a tubular extension of bearing 184. Rings 182 have projections 186 engaging slots in the tubular extension of bearing 184 (see also Figs. 12

and 13) and rings 183 are provided with slots en aging the feathered portions 187 of the sha t 153. The rings 182 and 183 are ressed together by compression spring 188. in 182 cannot rotate with respect to mec anism box 47 -wh ile rings 183 are forced to rotate with shaft 153. Pivoted to the frame pieces at 168 is a bell-crank 169, one arm of which is forked at 170 and abuts the flanged portion 164 of the intermediate member 160, while the other arm abuts a rod 171, slidably' mounted in the mechanism box 47. The rod 171 also abuts a lever 172 (see Fig. 22), ivoted at 173.. A com ression spring 1 4 presses the mterme late member 160 against the rollers 162 of the driving member 158 (see Fi 9) by means of the lever 172, the rod 17 and the bell-'- crank 169. The upper end of the lever 172 has pivoted thereto a pawl 176, pressed upwardly by a sprinIg-pressed plunger177 against a stop .178. awl 176 is adapted to engage the teeth of a ratchet wheel 179, having secured thereto a pinion 180 which meshes with ar 181 secured to the ewe 76 of the shaft 7'? (see also Fig. 17). e two arms carrying rollers 162 of the member 158, and the two arms car rollers 166 of the driven member 16 are equi-distant from the axis of shaft 153, and in the normal position (shown in Figs. 8 to 11 inclusive) are dis at right angles to each other around t e shaft 1 3 (see Fig. 24): Moreover, there is a uniform gs on each side of each arm of such exten t assuming the shaft'158 to bestationary an movement in either direction be'imparted to member 158, then the sides of those arms will not contact until the intermediate member 160 has almost contacted with hearing 184. Pin 175 (Fi 22) merely restrains the position of lever 2 and takes no art in the action of the mechanism.

erefore, when knob 156 is turned in.

' either direction, the rollers 162 carried thereby act upon the cam faces 163, andon account of the resistance to rotation of shaft 153 aflorded by its surrounding friction den vice, force the member 164 inwardly along the shaft 158, thereby causing the operation of the bell crank 169, to force the rod 171 adjusted vertically .by

and accordingly also raises the main Sleeve- 46 and the stonecarryinfi I means, whereby the stone is slightl wit drawn from the polishing surface. is action occurs irrespective of the direction of the turning movement given the knob 156. As the movement of the knob 156 is continued, the arms of the driving member 158 enga the arms of the driven member 167 (see ig. 24) so that further rotation of the driven member 16 and, consequently, the shaft'158, whereby miter ears 152 and 151 are rotated, causing the o0 ared nut 150 to be moved along the screw 149, and, cons uently, the mechanism box together with a l the stone carrying means are moved laterall over the polishin surface as far as desi with the stone st held in 31' htly raised position, until the roper ban or position on the polishing ap for the further polishing of the stone is reached. Uponv the release of the knob 156, the spring 174 acts to return the intermediate member 160 and the drivmg member 158 to their original positions, re ative'to the driven member 167, and the pawl 176 returns to its original position, permitting the stone to again contact with the lap 1. If it is deslred tomove the mechanism box and stone in the op site direction over the polishing lap, the oh 156 is tumed in the opposite direction and the parts will operate In a similar manner.

It is also desirable in the polishing of gems and particularly in the polishing of iamonds, that the stone be 'ven a slight reciprocation over the poli ing surface durmg the polishin operation at certain thereof, and at the amplitude and rate of these reciprocations be varied in accordance with theprogress of the polishing or grinding operation, and without having to stop the polishing operation and while the operator is continually watching the stone and the grind surface in engagement with it, and so t at the am litu e of the reci rocations may be varied y gradations itesimally small until no reciprocation whatever wlll take place. For this purpose the following mechanism is provided. The bar 190 has journaled therein a pin 191, from a small ibell crank 92 (see F188. 8, 0-, 21 and 96). which bell crank is slotted at 198 and in which slot there is positioned an anti-friction roller 194, carried u 11 an u right vertically-adiusted bar 19 which is adapted to he means of sleeve 196, Iurroun the lower end of the bar 195 by means 0 nut 197 and screwinwardly against the action of spring 174, thread in a frameon the guidebar 145, at in 198. The flange sleeve 196 is provided witha scale 199, in order that the height of the roller 194 may be accurately and closely adjusted. Bell crank 192 is also slotted at 200, and in the slot 200 is positioned an antifriction roller 201, carried eccentrically upon a disk 202, which disk is integral with shaft 203. having secured theieto a miter gear 204, meshing with a miter gear 205. on the back face of which is a bevel gear .300, meshing with a bevel pinion 208 on shaft 209 (see also Fig. 3), which shaft at its lower end has secured thereto a bevel gear 210. driven by a bevel pinion 211, driven by an electric motor 212. According] upon the rotation of the motor 212, the d i rotate (see Fig. 25) so that the roller 201, operating in the slot 200 rocks the bell crank 192 about the center of the roller 194, being held in fixed relation to the guide bar 145, the pin 191 will be forced to reci rocate longitudinally, carrying with it tie bar 190, and, consei uentl reciprocating tlte mechanism box 4 with the stone carrying means, thereby causin a reciprocation of the stone over t e polis iing surface. Upon turning the flanged sleeve 196, the roller 194'iuay be moved to various distances from the center of thepin 191, so as to vary the amplitude of these reciprocations. That is, if the center of roller 194 and pin 191 be made to coincide, no reciprocation of the stone will take place, but, as the bar 195 is screwed upwardly, carrying with it the roller 194. so that the center of the roller 19-1 is moved away from the center of the pin 191, reciprocation of the stone will take place, the amplitude of which reciprocations will be increased the farther the center of roller 194 is moved away or above the center of pin 191.

In order to vary the speed of these recip -ocat-ions, means are provided for varying'the speed of the motor which comprises a rheostat at 213, having contact ints at 21-1 (see Figs. 2 and 3), over whic i'contact points there sweeps a contact arm 215, carried by a segmental gear 216, meshing with a stud gear 218, operatcd by the pinion 219,

- carried upon the lower end of the shaft 220,

upon the upper end-of which shaft is a miter gear 221, meshing with a miter gear 222, upon the shaft 223, having fixed on its outer end an o crating handle 224, with a cooperating sca e 225 (see Fig. 1). Accordingly, as the handle 224 is moved, the contact arm 21-5 is caused to sweep over the contact points 214, and thus vary the resistance in the motor circuit in a well-known manner. and. accordingly, vary the speed of the reciprocations of the stone over the polishing surface. In order that the o rator may know at what )oint the ham I0 is being turned. without ookin at the same, but by touch, there is Stt'llltt to the opposite end of the shaft 223 a disk member 226 (see also sk 202 is caused to Fi 26), having over a portion of its perip cry recesses adapted to be engaged by a roller 227, carried upon an arm 228, pivoted at 229 and pressed upwardly by spring pressed plunger 230, so that the roller 227 is caused to engage the recesses and projections of disk 226 with a spring pressure. As the operator moves the handle 224, to cause the contact arm 215 to sweep from one contact point 214 to another, the spring pressed plunger 230 at first tends to retard this movement, but upon the roller 227 passing over the apex of the next projection, tends to cause the rotation of the disk 226. so as to bring the contact arm 215 into contact with the next contact 214. In this way the operator may tell by touch just when he has reached the next. or anv desired step of re sistance of the rheostat. and, consequently. any desired speed of reciprocation of the stone over the polishing surface.

In order that the stone 3 may be easily lifted or withdrawn from the polishing lap 1, for inspection, without stopping anv of the apparatus or interfering w th any of the adjustments and in such a manner that it can be readily replaced upon the lap for continuing the polishing operation while the apparatus is still running and without making any new adjustments, the following arrangement is provided.

The longitudinal guide 145 forms part of a frame piece 145' (see Figs. 2, 3, 4 and 8). This frame piece 145 is journaled to revolve about a horizontal axis, parallel to the plane of the polishing surface, by means of ivot pins 231 and 232, in the main frame 33, secured rigidly to a table or other suitable device 234:, by means of screws 235, the pm 231 being screwed into the frame, in order that it may be easily withdrawn and inserted for the purpose of putting the frame 145' into position, and in order that the'pin 231 ma be tightened up to form a tight bearing or the frame piece 145. a lock nut 236, being secured thereon. On an iipriglit roJection 237 on frame piece 145 is pivote a lever 238, having a handle 239. The lever 238 is adapted to engage a short lever 240 on a rocking shaft 2451, journnled in the ,u ri ht projection 237 at the other end of w ic rocking shaft 0 short lever 2&2 is adapted to engage a pin. 243, slidahly mounted through the frame piece 1+5, having its lower and adapted to engage the outer end of lever 244 (see also Figs. 20 and 21), which is normally pressed u wardly by a. spring pressed plun r 245, in Bic main frame 283. The lever 2 is pivoted to the main frame at 246, and is provided with a hooked end 247, adapted to engage the ends of a lug 248 when normall premd upwardly .y the spring pressed lunger 245, the in 248 being integral with the frame piece 45' and guide 145, so that when the hooked end 247 engages the lug 248, it is impossible to rotate the frame piece 145 and parts carried thereby upwardly as shown in Fig. 3, the same being locked by the engagement of the hooked end 247 with the lug However, when the handle 239 is thrown clockwise, as indicated in Fi 3, it acts upon the lever 240 of the roe 'ng shaft 241, to cause the lever 242 to press the pin 243 downward, which forces the lever 244 out of engagement with the In 248, and thereupon a further movement 0 the handle 239' in a clockwise direction, as viewed in Fig. 3, causes the frame piece 1-15 and parts carried thereby to be rotated in clockwise direction, as viewed in Fig. 3, so as to bring the parts in position as shown in l ig. This movement may be continued until the other end of the In 248 abuts the outer portion of the hooke end 247 of the lever 244, whereupon the parts will be maintained in the position shown in Fig. 3. A reverse movement of the handle 23!) will bring the parts back in normal position with the stone 3 upon the grinding surface and the spring pressed plunger 245 will press the hoo .ed portion'247 of lever 244 into engagement with the lug 248, so as to lock the parts in normal upright position, as shown in Figs. 1. 4 and 20.

In this connection it will be noted that the stone 3 is carried at one side of the plane, passing through the axis of the revolu-ble frame 233 and erpendicular to the polishing surface, so Stat it is not necessary to lift the frame as a whole, or to change-any of the adjustments in order to raise the stone for inspection in this manner, as illustrated. in Fig. 3.

It will be seen referring more particularly to Fig. 14, that the parts 46, 45, 50, 58, 60, 62- ;&c., all form what may be termed a main spindle, slidably mounted in the frame '47, to move toward the lap, and which spindle carries the stone to be polished in enga ment with the lap by means of the carrym head 15 and its associated parts. This :(pmdle may be considered as being divid into three parts, namely, a lower part comprising parts 46, 45 and 50, an

other part 58, and a third part, 62,-each. of which three parts is adjustable, one with respect to the other in series relation, and that the flange sleeve 55 and screw 60 serve respectively as means for adjusting the lower or carryin part with respect to the second part of t e s indle, and for adjusting the third part 2 with res set to the second part. 58 of this main spind e, and that the operation of the adjusting flange sleeve 55 acts to move the stone into different positions with respect to the out afl'ectin grinding in to take up polishing lap, withthe trippm mechanism or icator 106. e springs 64 act back lash between said three spindle parts. When the scale 56 reads at zero, the renter of the arc of the arruate guide 2() lies in the plane of the polishing surface of the lap 1. It will he understood that when the third part (32 of the said named spindle is moved a predeterminod distance toward the polishing lap, the tripping mechanism will be affected to withdraw the stone from the polishing lap as above explained.

The general operation of the machine is as follows:

The mechanism box 47 is swung into horizontal position by means of the handle 239 for easy access to and manipulation of the arbor 4. Then, if the stone to be ground is not. more than about ono-eighth of an inch in diameter of girdle, the settingscale 33 is placed at zero, by means of the flange sleeve 32, which brings the settingindirator 40 so as to point toward the center of the dop-arc or arcuate guide 20. The stone-containing arbor 4 is then plat-ed in the dop-spindle 5 and secured therein by tightening the screw 6. The stone is then adjusted into position so that the girdle of the stone is in line with the setting indirator 40 while the setting scale is at the aforementioned zero position. This is effected as follows:---Tlie setting indicator 40 is brought into positio by means of the flange sleeve 32, near to, yet fully clear .of the stone. The dop-spindle 5 is sustainedly unlocked by depressing the latch lever 29, and the dop-spindle sleeve 9 is unclamped by means of the screw 16. The stone-containing arbor 4 is adjusted longitudinally by means of the flanged nut 13 until the girdle of the stone is apparently in line with the' Setting indicator 40. The dop-spindle 5 is then rotated by means of its index flange 11, while the settin indicator 40 is br ught. by means of t 1e knob 43, close to the girdle. of the stone; it will then be seen if further longitudinal adjustment of the dop-spindle 5 be necessary. After complete 1\( justment in this respect, the dop-spindle sleeve 9 is clamped by means of screw 16, the setting indicator 4') is put back in original position by means of the knob 43, the latchlever 29 is put. in original position and the index-flange 1'1 is rotated until the locking lever 24 snaps into the desired notch at 23.

The dop or carrying head 15 should then be placed into correct position which de- 

